[Milsurplus] RHZ again

[Charlie L.]

I don't think they are overtone or the circuit is a multiplier based  on
the schematic shown below.  I have tried doubling and tripling the freq and
adding 455 KC and it still does not end up in the HF aviation band of the
day.  Triple it and you end up in the 75 meter band.  The manual on Nick's
site is a 1965 school book from the FAA academy, and while it does include
a schematic and an explanation of how the RX works, it has no details or
relevant info on how to change ranges, or even a list of available coil
sets in that era.  Interesting to note, that the RUP, and RCQ style
receivers,  similar to the National NC100, plus 51J4's at some stations,
were used into the late 1990's for listening to WWV to set station clocks,
and things like the time code generator in voice recorder systems. .  They
got replaced by a GPS based RX that fed time data directly into the systems
that required it.   Some field offices in the 1970's bought the Heathkit
'Most Accurate Clock', that picked the best signal on 5, 10, or 15 MC WWV
and displayed the station time.

Charlie

[image: image.png]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20260930/8229bc98/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 18308 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20260930/8229bc98/attachment-0001.png>